.blog-content {
    padding: 30px;/*内边距*/
}

.blog-content h3 {
    text-align: center;
    padding: 20px 0px;/*上下20,左右0*/
}

.blog-content .date {
    text-align: center;
    color: rgb(0, 52, 174);
    padding: 0px 0px 10px 0px ;
}

.blog-content p {
    text-indent: 2em;/*首行缩进两个字符*/
}